全额贷记至this answer 堆栈溢出：您需要设置create_posts 值到do_not_allow （或false 在4.5以下的Wordpress版本中），并将map_meta_cap 到true:

register_post_type( \'custom_post_type_name\', array(
    \'capability_type\' => \'post\',
        \'capabilities\' => array(
        \'create_posts\' => \'do_not_allow\', // Prior to Wordpress 4.5, this was false
    ),
    \'map_meta_cap\' => true, //  With this set to true, users will still be able to edit & delete posts
));